Ionis Pharmaceuticals Inc (IONS)
Who owns Ionis Pharmaceuticals Inc (IONS)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.2% of the shares are freely tradable; institutional investors hold 107.3%.
Ownership Structure
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| FMR Inc | 14.86 | 24,556,637 | +2.0 | 03/31/2026 |
| Capital World Investors | 12.82 | 21,186,369 | +18.0 | 03/31/2026 |
| Vanguard Group Inc | 9.95 | 16,440,459 | -0.3 | 12/31/2025 |
| BlackRock Inc | 6.32 | 10,442,476 | -1.9 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 4.73 | 7,808,902 | +0.0 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.31 | 7,118,330 | +0.0 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Fidelity Growth Compy Commingled Pl S | 6.69 | 11,053,742 | +0.4 | 04/30/2026 |
| Fidelity Growth Company Fund | 5.11 | 8,436,932 | +0.3 | 04/30/2026 |
| Capital Group Growth Fnd of Amer Comp | 4.64 | 7,668,655 | +19.8 | 03/31/2026 |
| American Funds Growth Fund of Amer A | 4.64 | 7,668,655 | +19.8 | 03/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 31. Jul 2026 | Hayden Michael R | Director | Buy | 5,000 | 51.60 | 258,000 |
| 30. Jul 2026 | Hayden Michael R | Director | Buy | 15,000 | 53.38 | 800,700 |
| 15. Jul 2026 | Herman Joan E | Director | Other | 5,220 | 0.00 | – |
| 15. Jul 2026 | Berthelsen Spencer R | Director | Other | 5,220 | 0.00 | – |
| 7. Jul 2026 | Bennett C Frank | EVP, Chief Scientific Officer | Sell | 15,000 | 85.46 | 1,281,930 |
| 7. Jul 2026 | Bennett C Frank | EVP, Chief Scientific Officer | Other | 15,000 | 0.00 | – |
| 7. Jul 2026 | Bennett C Frank | EVP, Chief Scientific Officer | Sell | 5,536 | 83.58 | 462,693 |
| 7. Jul 2026 | Diaz Allene M. | Director | Sell | 10,111 | 85.42 | 863,637 |
| 7. Jul 2026 | Diaz Allene M. | Director | Other | 10,111 | 47.11 | 476,329 |
| 7. Jul 2026 | Kordasiewicz Holly B. | EVP, Chief Development Officer | Sell | 362 | 84.30 | 30,517 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character.
View all insider transactions →Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.